package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

    @Autowired
    private CategoryService categoryService;

    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     * @param setmealDto
     */
    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().map(setmealDish -> {
            setmealDish.setSetmealId(setmealDto.getId());
            return setmealDish;
        }).collect(Collectors.toList());
        //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    @Override
    public SetmealDto getByIdWithDto(Long id) {
        Setmeal setmeal = this.getById(id);
        SetmealDto setmealDto = new SetmealDto();
        BeanUtils.copyProperties(setmeal, setmealDto);
        Category category = categoryService.getById(setmeal.getCategoryId());
        setmealDto.setCategoryName(category.getName());
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId, setmeal.getId());
        List<SetmealDish> setmealDishes = setmealDishService.list(queryWrapper);
        setmealDto.setSetmealDishes(setmealDishes);
        return setmealDto;

    }

    /**
     * 删除套餐，同时需要删除套餐和菜品的关联数据
     * @param ids
     */
    @Override
    @Transactional
    public void removeByIdsWithDish(List<Long> ids) {
        //select count(*) from setmeal where id in (1,2,3) and status = 1
        //查询套餐状态，确定是否可用删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId, ids).eq(Setmeal::getStatus, 1);
        int count = this.count(queryWrapper);
        if (count > 0) {
            //如果不能删除，抛出一个业务异常
            throw new CustomException("在售不可以删除");
        }
        //delete from setmeal_dish where setmeal_id in (1,2,3)
        LambdaQueryWrapper<SetmealDish> setmealDishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealDishLambdaQueryWrapper.in(SetmealDish::getSetmealId, ids);
        //删除关系表中的数据----setmeal_dish
        setmealDishService.remove(setmealDishLambdaQueryWrapper);
        this.removeByIds(ids);
    }

    @Override
    @Transactional
    public void updateWithDish(SetmealDto setmealDto) {
        this.updateById(setmealDto);
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId, setmealDto.getId());
        setmealDishService.remove(queryWrapper);
        if (setmealDishes.size() > 0) {
            setmealDishes = setmealDishes.stream().map(setmealDish -> {
                setmealDish.setSetmealId(setmealDto.getId());
                return setmealDish;
            }).collect(Collectors.toList());
            setmealDishService.saveBatch(setmealDishes);
        }
    }
}
